Here's why:

* Not all studies are considered publishable. Some studies might be preliminary, have inconclusive results, or be too specialized for a broad audience.

* Some studies are proprietary. Companies or institutions might conduct research for their own internal purposes and choose not to share it publicly.

* Alternative methods of sharing. Scientists use other methods to share their work, like:

* Conferences: Presenting findings at conferences allows for discussion and feedback from peers.

* Preprints: These are drafts of papers posted online before peer review, making research accessible faster.

* Data repositories: Sharing raw data allows others to analyze and replicate findings.

* Collaboration: Direct collaboration between researchers often leads to sharing of unpublished research.

In summary: While publications play a crucial role in scientific dissemination, they are not the only way to share research findings. The choice of how to share research depends on the study's nature, the goals of the researchers, and the field of study.